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Astrophysical Bulletin

, Volume 74, Issue 4, pp 475–489 | Cite as

Unity and Diversity of Yellow Hypergiants Family

  • V. G. KlochkovaEmail author
Article

Abstract

We present the results of long-term spectral monitoring of yellow hypergiants (YHGs) of northern hemisphere with a R ≥ 60 000 resolution. The spectra of these F–G stars of extreme luminosity, compactly located at the top of the Hertzsprung–Russell diagram revealed a variety of spectral features: various types of Hα profile, the presence (or absence) of forbidden and permitted emissions, as well as circumstellar components. Variability of spectral features of various nature is studied. Absolute luminosity, circumstellar envelope expansion rate and amplitude of pulsations are determined. The reliability of the YHG status for V1427 Aql is confirmed; manifestations of a significant dynamic instability of the upper layers of the atmosphere of ρ Cas after the 2017 ejection and stratification of its gas envelope are registered; the lack of companion in the system of the V509 Cas hypergiant is proven; a conclusion is made that the V1302 Aql hypergiant is approaching the low-temperature boundary of the Yellow Void.

Key words

stars AGB and post-AGB—stars evolution—stars oscillations 

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Notes

Acknowledgments

The author is grateful to his co-authors who participated in the implementation of the supergiant spectroscopy program at the BTA and in the preparation of joint publications. We made use of the astronomical databases SIMBAD, SAO/NASA ADS, AAVSO and VALD.

Funding

Observations with the telescopes of the SAO RAS are supported by the Ministry of Science and Higher Education of the Russian Federation. The author thanks The Russian Foundation for Basic Research for the financial support (project 18–02–00029 a).

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Copyright information

© Pleiades Publishing, Ltd. 2019

Authors and Affiliations

  1. 1.Special Astrophysical ObservatoryRussian Academy of SciencesNizhnii ArkhyzRussia

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